(Reuters) The National Biodiesel Board said on Thursday it has filed a petition to the US government to investigate imports from Argentina and Indonesia, saying they have violated trade laws by flooding the US market with dumped, subsidized biodiesel. The National Biodiesel Board filed the request with the US Department of Commerce and US International Trade Commission on behalf of US biodiesel producers, who have been hit by soaring imports of the biofuel in recent years, the group said in a statement.